Solenogaster Mollusks — Schwabl 
The reproductive organs consist of a short 
reproductive gland, a long unpaired ( ! ) gono- 
pericardial duct, and the typical gonoducts with 
their ciliated glandular parts. The pericardium 
is wide and short, its appendages unite ven- 
trally and surround the supra-rectal ganglion 
as well as the distinct gill-sinus, but do not 
extend backwards along the cloacal chamber. 
Blood cells are present. The animal possesses 
two pairs of gills of a rather primitive structure. 
DISTRIBUTION: Southern California, chiefly 
in the San Pedro area; 62 specimens all from 
considerable depth, between 293 and 454 fm. 
Eleven samples were taken, 9 from mud ( 5 in 
the glass sponge area), and only 2 samples 
( with 4 specimens ) came from other than mud 
(gravel or sandy mud). Figure 4 shows one 
from station 2802. 
Fig. 8. Crystallophrisson incrassatum. Sta. 3831-55. 
267 
GENUS Crystallophrisson Mobius, 1875 
Type C. nitidulum (Loven) 1844 
Includes Chaetoderma Loven, 1845, preoccu- 
pied in Pisces by Swainson, 1839 (see Thiele, 
1932). 
Crystallophrisson incrassatum n. sp. 
Fig. 8 
COLLECTIONS: 
3731 (2) in 275 fm, with Limifossor fratula. 
3733 (2) in 305 fm. 
DIAGNOSIS: The animals were very poorly 
preserved; the diagnosis therefore is largely 
based on external appearances. 
Spicules were totally lacking but the species 
obviously possessed these structures originally. 
The habitus is very characteristic (Fig. 8). 
The body is very stout; the length ranges from 
12-17 mm, the greatest diameter between 3 
and 4.5 mm, and the length index is 4-5. The 
prothorax is white, highly swollen, and may 
attain a third of the total length of the animal. 
Color of the body is gray, covered with mud. 
The metathorax is slender and short; the pre- 
abdomen is swollen and contains the particu- 
larly large liver. The postabdomen forms a 
characteristic conical ring around the cloacal 
opening; the gills are mostly protruding from 
the cloacal chamber. Buccal, dorsal, and lateral 
salivary glands are present. A "tongue” is pro- 
vided with a sharp chitinous edge on both 
sides behind the main tooth, but real teeth 
are lacking. There are four pairs of precerebral 
ganglia. The muscles consist of one pair of 
dorsal and some pairs of lateral retractors at the 
front end. Granular cells are also situated on 
the numerous septa dividing the liver into 
countless lobules. 
DISTRIBUTION: This is known only from the 
Santa Barbara basin, southern California, in 
about 300 fm, in mud. Fig. 8 an individual 
in station 3731. 
Crystallophrisson recisum n. sp. 
Figs. 9, 10 
COLLECTION: 2895 (1) in 265 fm. 
DIAGNOSIS: This is a small species, measur- 
ing 11 mm long, with an average diameter of 
